From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oa1-f77.google.com (mail-oa1-f77.google.com [209.85.160.77]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B102239B497 for ; Sat, 8 Aug 2026 20:09:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.160.77 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786219774; cv=none; b=f+xf3tuenrGhztFPm8iho/p4lM1hfRYS7wZyD7QjVUs7TsF+sXhjhkDK/W80Q8iYJmWPkt0LXiHPCGdq13+V9015aip1oa8hJVcHKBOFgB17sh0DkSNWvE4n7+JBUTMmaNJxcr46fk3XrA1bwF7jGwnaFNRSvOFZD86NdS1/E14= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786219774; c=relaxed/simple; bh=7k4Sd9kgwfoHkkThsjls/1q0u92Ydg1BFZFLcGIUl6w=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=CxfGDOlPFesO03UwHp/Uqme5VAV/i8Aeoq+WKtlCVt4wd1onKrrFPhyCGHRGiNh0NWTsfgI7YyzR7jJBfTi/25/VY0ZXAEQqH1zBZ7kIIbJe4HQqeHx4rMvhMiX3DRslQKzlK37156zabhw0F52cuJasy5P3rlt6ta2znSYCQ0Q= ARC-Authentication-Results:i=1; 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AHgh+Rr3qgO+ijz609GGXCBCGBS6dfFh5Ee9bTpcBEkksBgH5UEQjN+9VI12i89sbqkrmZDhfVkrNO5ZWoSGZ9U=@vger.kernel.org X-Gm-Message-State: AOJu0YwkNY9oh7MNtGSkOuUqhBQ1ZTWHfzJesh4j1jxfa2gICU37Thuz 69tXoAXglSxjrVMgPozvgNnhE9yO9WmCYyWXP46/xN4PfvRpGLSBAroFKK8c/6NSrNkYRDw6kOQ eNAAZ/VbeE6HpZC+sYdT4ahYr2IRiAxtOAaLBX5LCuE6N9CaOegGbRg+nxpY= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:238d:b0:492:5684:7ab3 with SMTP id 5614622812f47-4afadf17a51mr17716708b6e.21.1786219771710; Sat, 08 Aug 2026 13:09:31 -0700 (PDT) Date: Sat, 08 Aug 2026 13:09:31 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a778cfb.9c11d2ce.289b96.00b7.GAE@google.com> Subject: [syzbot] [block?] WARNING in blk_mq_free_tag_set From: syzbot To: axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 6b8c8af514d7 Add linux-next specific files for 20260807 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=11d2bfb9580000 kernel config: https://syzkaller.appspot.com/x/.config?x=6d343b54cc50df0f dashboard link: https://syzkaller.appspot.com/bug?extid=02b37e31e64ea5cb6d29 compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10f56132580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/71ff4edcb608/disk-6b8c8af5.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/1f5fa331d8f2/vmlinux-6b8c8af5.xz kernel image: https://storage.googleapis.com/syzbot-assets/f993558ec63b/bzImage-6b8c8af5.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+02b37e31e64ea5cb6d29@syzkaller.appspotmail.com ------------[ cut here ]------------ timer_delete_sync(&sdp->delay_work) WARNING: kernel/rcu/srcutree.c:706 at cleanup_srcu_struct+0x3aa/0x890 kernel/rcu/srcutree.c:706, CPU#1: kworker/u8:11/3800 Modules linked in: CPU: 1 UID: 0 PID: 3800 Comm: kworker/u8:11 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Workqueue: nbd-del nbd_dev_remove_work RIP: 0010:cleanup_srcu_struct+0x3aa/0x890 kernel/rcu/srcutree.c:706 Code: b9 8a 00 48 83 7d 00 00 4c 8b 74 24 10 0f 85 dd 03 00 00 41 ff c5 41 83 e5 0f 41 83 fd 07 0f 86 0e ff ff ff e9 ab 00 00 00 90 <0f> 0b 90 4c 8d b5 00 02 00 00 4c 89 f3 48 c1 eb 03 48 b8 00 00 00 RSP: 0018:ffffc9000e69f9d0 EFLAGS: 00010202 RAX: 0000000000000001 RBX: 0000607edad2e8c0 RCX: 0000000000000000 RDX: 0000000000000006 RSI: ffffffff8e253559 RDI: 00000000ffffffff RBP: ffffe8ffffc3a8c0 R08: ffffffff9058fb7f R09: 1ffffffff20b1f6f R10: dffffc0000000000 R11: fffffbfff20b1f70 R12: ffff88802b760000 R13: 0000000000000000 R14: ffffffff8e5237d0 R15: 1ffffffff1ca47de FS: 0000000000000000(0000) GS:ffff88812500c000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fbb3d026e9c CR3: 000000000e948000 CR4: 00000000003526f0 Call Trace: blk_mq_free_tag_set+0x617/0x780 block/blk-mq.c:4976 nbd_dev_remove drivers/block/nbd.c:269 [inline] nbd_dev_remove_work+0x4f/0xe0 drivers/block/nbd.c:284 process_one_work kernel/workqueue.c:3375 [inline] process_scheduled_works+0xc4e/0x1630 kernel/workqueue.c:3458 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3539 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup